Where can I find literature on designing (calculating performance) of an IP-PBX server?

Question

Telephony

It is necessary to design a server for a cloud PBX for 10k users, but I cannot find literature to calculate the required server power.

Answer 1

Since the server power requirements directly depend on the software used, you should study the documentation for the specific soft-PBX that you plan to use, for example: Asterisk: The Definitive Guide, Appendix C - Preparing a system for Asterisk

Answer 2

The main resource costs are not with a large number of users, but with the number of simultaneous conversations and transcoding of conversation records. Critical percent and operative, as well as the disk subsystem with a mandatory raid.

Answer 3

If 10k plus is the level of the service provider.
There is large-caliber software, for example, from Broadsoft, inside which everything is provided, virtual domains, spacing of registrars and media processors, sizing, etc.
It is important to take into account the load pattern: an ordinary enterprise / home - a ratio of simultaneous calls is taken 1/5. If the call center - everything is different.
Also gateway clients. If they work on the same codec and do a reinvite, this is a completely different load.
Pay attention to the advice of Comrade Dmitry Chervonobab - they are correct.